Frequencies for first 10,000 rows of retprn variable in nhamcsed2004 dataset :

  return if |
    needed, |
p.r.n./appt |
          . |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      6,236       62.36       62.36
        yes |      3,764       37.64      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016